These are the standard, default quick responses that come with the HTC One M8, apart from this one, which I have added myself, "Meeting canceled." If we wanted to edit any of these for any reason, we can do that by pressing down on the option.

Just press down on it, and a window with a text box will appear, allowing us to edit it

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The keypad has also appeared. First, move the cursor to the desired position. Let's place it right at the end. The gray arrow is the cursor. We can drag it by pressing down, and swiping left or right, to the position where we want it.